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This is\nbecause another process had acquired the device's master mutex in\ndrm_setmaster_ioctl(), then overwrote fpriv->master in\ndrm_new_set_master(). The old value of fpriv->master was subsequently\nfreed before the mutex was unlocked.\n\nTo fix this, we lock the device's master mutex before retrieving the\npointer from from fpriv->master. This patch passes the Syzbot\nreproducer test."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/gpu/drm/drm_ioctl.c"], "versions": [{"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "17dab9326ff263c62dab1dbac4492e2938a049e4", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "7d233ba700ceb593905ea82b42dadb4ec8ef85e9", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "b246b4c70c1250e7814f409b243000f9c0bf79a3", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "491d52e0078860b33b6c14f0a7ac74ca1b603bd6", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "f773f8cccac13c7e7bbd9182e7996c727742488e", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "b436acd1cf7fac0ba987abd22955d98025c80c2b", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/gpu/drm/drm_ioctl.c"], "versions": [{"version": "4.14.237", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver"}, {"version": "4.19.195", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.4.126", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.44", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.12.11", "lessThanOrEqual": "5.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.13", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "references": [{"url": "https://git.kernel.org/stable/c/17dab9326ff263c62dab1dbac4492e2938a049e4"}, {"url": "https://git.kernel.org/stable/c/7d233ba700ceb593905ea82b42dadb4ec8ef85e9"}, {"url": "https://git.kernel.org/stable/c/b246b4c70c1250e7814f409b243000f9c0bf79a3"}, {"url": "https://git.kernel.org/stable/c/491d52e0078860b33b6c14f0a7ac74ca1b603bd6"}, {"url": "https://git.kernel.org/stable/c/f773f8cccac13c7e7bbd9182e7996c727742488e"}, {"url": "https://git.kernel.org/stable/c/b436acd1cf7fac0ba987abd22955d98025c80c2b"}], "title": "drm: Fix use-after-free read in drm_getunique()", "x_generator": {"engine": "bippy-5f407fcff5a0"}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:32:08.124Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/17dab9326ff263c62dab1dbac4492e2938a049e4", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/7d233ba700ceb593905ea82b42dadb4ec8ef85e9", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/b246b4c70c1250e7814f409b243000f9c0bf79a3", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/491d52e0078860b33b6c14f0a7ac74ca1b603bd6", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/f773f8cccac13c7e7bbd9182e7996c727742488e", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/b436acd1cf7fac0ba987abd22955d98025c80c2b", "tags": ["x_transferred"]}]}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-47280", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-09-10T15:39:32.193453Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T17:33:10.272Z"}}]}}

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{"descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm: Fix use-after-free read in drm_getunique()\n\nThere is a time-of-check-to-time-of-use error in drm_getunique() due\nto retrieving file_priv->master prior to locking the device's master\nmutex.\n\nAn example can be seen in the crash report of the use-after-free error\nfound by Syzbot:\nhttps://syzkaller.appspot.com/bug?id=148d2f1dfac64af52ffd27b661981a540724f803\n\nIn the report, the master pointer was used after being freed. This is\nbecause another process had acquired the device's master mutex in\ndrm_setmaster_ioctl(), then overwrote fpriv->master in\ndrm_new_set_master(). The old value of fpriv->master was subsequently\nfreed before the mutex was unlocked.\n\nTo fix this, we lock the device's master mutex before retrieving the\npointer from from fpriv->master. This patch passes the Syzbot\nreproducer test."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drm: corrige la lectura de use after free en drm_getunique(). Hay un error de tiempo de verificaci\u00f3n a tiempo de uso en drm_getunique() debido a la recuperaci\u00f3n de file_priv. ->master antes de bloquear el mutex maestro del dispositivo. Se puede ver un ejemplo en el informe de fallo del error de use after free encontrado por Syzbot: https://syzkaller.appspot.com/bug?id=148d2f1dfac64af52ffd27b661981a540724f803 En el informe, el puntero maestro se utiliz\u00f3 despu\u00e9s de ser liberado. Esto se debe a que otro proceso adquiri\u00f3 el mutex maestro del dispositivo en drm_setmaster_ioctl() y luego sobrescribi\u00f3 fpriv->master en drm_new_set_master(). El antiguo valor de fpriv->master se liber\u00f3 posteriormente antes de que se desbloqueara el mutex. Para solucionar este problema, bloqueamos el mutex maestro del dispositivo antes de recuperar el puntero desde fpriv->master. Este parche pasa la prueba del reproductor Syzbot."}], "id": "CVE-2021-47280", "lastModified": "2024-11-21T06:35:47.347", "metrics": {}, "published": "2024-05-21T15:15:16.277", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/17dab9326ff263c62dab1dbac4492e2938a049e4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/491d52e0078860b33b6c14f0a7ac74ca1b603bd6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7d233ba700ceb593905ea82b42dadb4ec8ef85e9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b246b4c70c1250e7814f409b243000f9c0bf79a3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b436acd1cf7fac0ba987abd22955d98025c80c2b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f773f8cccac13c7e7bbd9182e7996c727742488e"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://git.kernel.org/stable/c/17dab9326ff263c62dab1dbac4492e2938a049e4"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://git.kernel.org/stable/c/491d52e0078860b33b6c14f0a7ac74ca1b603bd6"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://git.kernel.org/stable/c/7d233ba700ceb593905ea82b42dadb4ec8ef85e9"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://git.kernel.org/stable/c/b246b4c70c1250e7814f409b243000f9c0bf79a3"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://git.kernel.org/stable/c/b436acd1cf7fac0ba987abd22955d98025c80c2b"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://git.kernel.org/stable/c/f773f8cccac13c7e7bbd9182e7996c727742488e"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: drm: Fix use-after-free read in drm_getunique()", "id": "2282517", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282517"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-367->CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndrm: Fix use-after-free read in drm_getunique()\nThere is a time-of-check-to-time-of-use error in drm_getunique() due\nto retrieving file_priv->master prior to locking the device's master\nmutex.\nAn example can be seen in the crash report of the use-after-free error\nfound by Syzbot:\nhttps://syzkaller.appspot.com/bug?id=148d2f1dfac64af52ffd27b661981a540724f803\nIn the report, the master pointer was used after being freed. This is\nbecause another process had acquired the device's master mutex in\ndrm_setmaster_ioctl(), then overwrote fpriv->master in\ndrm_new_set_master(). The old value of fpriv->master was subsequently\nfreed before the mutex was unlocked.\nTo fix this, we lock the device's master mutex before retrieving the\npointer from from fpriv->master. This patch passes the Syzbot\nreproducer test.", "A vulnerability was found in the Linux kernel's DRM, where the drm_getunique() function can read a pointer after it has been freed. This occurs because the function retrieves a pointer without properly locking the device's master mutex, leading to a potential crash if another process modifies the pointer first."], "mitigation": {"lang": "en:us", "value": "Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible."}, "name": "CVE-2021-47280", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47280\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47280\nhttps://lore.kernel.org/linux-cve-announce/2024052153-CVE-2021-47280-4344@gregkh/T"], "statement": "This vulnerability is rated as a moderate severity because the risk of crash and instability in the system requires specific conditions related to concurrent access to the device's resources.", "threat_severity": "Moderate", "upstream_fix": "kernel 4.14.237, kernel 4.19.195, kernel 5.4.126, kernel 5.10.44, kernel 5.12.11, kernel 5.13"}